gps: Add dummy functions stubs

* sec_gps_conf
* Sec_Configuration

Change-Id: Id50229979981fb072a382456f64aac3fccb6cb7e
fstab: remove length parameter for encryption

* This is not needed and actually causes encryption to fail
  most of the time.

Change-Id: I86bdffccab213e4e06609c1c179666fab30ea7c6
fstab: support ext4 and f2fs data and cache

Change-Id: I4b6c1cbd35c7e368573b36c1d93af4cc5e93d113